JP2676061B2 - Printer bail device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bail device for a printer, and more particularly to a device which can effectively set a bail roller in both a loading position and a release position.

[Prior Art] A printer that performs a desired printing operation by reciprocally moving a print head such as dots, thermal, or inkjet that moves along the platen by winding cut paper or tractor paper around the platen with the carriage along the platen. Widely used.

In such a printer, auto-loading the cut paper or tractor paper is extremely useful for improving the operability of the printer, and various auto-paper loading mechanisms have been put to practical use in the past.

In such automatic paper loading, the paper may be inserted into a predetermined position and then the paper feeding mechanism may be used to suck the front end to a predetermined position. At this time, the bail roller that holds the paper in a proper pressure-bonded state with respect to the platen. Was a major obstacle to such automatic paper loading.

Normally, this bail roller is swung to a release position where it is separated from the platen manually before auto paper loading, but in order to manually move such a bail roller lever, the position of the bail roller is restricted, In this case, the bail roller is arranged to face the upper side of the platen, which causes a problem that a large blank area of the paper from the print head to the bail roller must be set so that the paper can reach the bail roller correctly. there were.

Further, the manual swinging of the bail roller inevitably causes the lever for swinging the bail roller to be projected out of the printer cover. As a result, the outer shape of the printer is enlarged and printing is performed in the opening hole of the lever penetrating the printer case. There was a problem that noise leaked to the outside.

Conventionally, a mechanism has been considered in which the bail roller is automatically swung during autopaper loading.

In both JP-A-62-73978 and JP-A-62-162577, the bail roller is oscillated by a dedicated motor to automatically release the bail roller from the platen at the time of loading the paper, and to load again toward the platen. The printers that can be used are shown.

Further, JP-A-60-21278, JP-A-62-62579, JP-A-61-130446, JP-A-61-85448 and JP-A-61-152.
No. 444 shows a structure in which the bail roller is swung to the loading position and the release position by the driving force of the carriage carrying the head.

Further, in Japanese Patent Laid-Open No. 63-49465, a paper feed driving force is transmitted to a bail roller by a rocking gear, loading and releasing of the bail roller are controlled, and movement of the rocking gear is controlled by a head carrier (carriage). The configuration is shown.

[Problems to be Solved by the Invention] However, since the swinging of the bail roller by the dedicated motor described above requires a dedicated motor or solenoid only for swinging the bail roller for auto paper loading, the external dimensions and weight of the printer are wasted. However, there is a problem that the device is expensive.

Further, in the conventional device that swings the bail roller by using the driving force of the carriage, the paper must be loaded while holding the bail roller lever outside the printing area in order for the carriage to hold the bail roller at the release position. Therefore, there is a problem that the carriage centering cannot be performed at the time of feeding the paper.

Therefore, since the paper fed to the bail roller cannot be pressed by the carriage, there is a problem that jamming occurs at the bail roller position at the time of feeding the paper.

Further, since the swing of the bail roller is determined only by the movement amount of the carriage, there is a problem that it is relatively difficult to set a correct release position.

Further, in the conventional device having the clutch mechanism by the swinging gear, only the normal rotation driving force of the paper feeding driving force is used for the release action of the bail roller, and the release driving is performed only by the release pattern predetermined by the cam. There is a problem in that the bail roller cannot be finely controlled without being controlled.

When the bail roller is driven only by the forward rotation of the paper feed drive force, especially, the paper is returned in reverse so that high-density printing can be performed, or the paper can be returned in order to print by dividing the width of the paper. In such a case, there is a problem that the bail roller cannot be held at the release position and fine print control such as upper margin printing in the bail roller released state cannot be performed.

The present invention has been made in view of the above conventional problems, and in the bail device that moves the position of the bail roller by utilizing the driving force of the intended feeding mechanism, the bail roller can be moved to the loading position or the release position as necessary. It is an object of the present invention to provide a bail device for a printer capable of effectively moving and holding both.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a platen that winds and holds a sheet at a predetermined printing position, a bail roller that presses the sheet against the platen, and a predetermined amount of the sheet. A printer including: a paper feeding mechanism that feeds paper; a print head that performs a predetermined printing action on paper relative to the platen; and a carriage that feeds and drives the print head along the platen axis direction. A rocking mechanism that rocks between a loading position that is pressed against the bail roller and the platen and a release position that is separated from the platen; and a rocking mechanism that is provided between the rocking mechanism and the paper feeding mechanism and that moves by the paper feeding mechanism. A clutch mechanism for transmitting or releasing a driving force, wherein the driving force is transmitted when the carriage moves out of the printing area, When the carriage is in the print area, a clutch mechanism that releases the transmission of the driving force from the paper feed mechanism to the swing mechanism, and a toggle mechanism that holds the loading position and the release position of the bail roller in an elastic pressure state, respectively. The clutch mechanism is engaged and disengaged by the movement of the carriage, and the bail roller swings in the loading position direction due to the rotation of the paper feed mechanism in one direction during the transmission of the driving force of the clutch mechanism. The bail roller is swung in the release position direction, the bidirectional swing between the bail roller loading position and the release position is performed by the driving force of the paper feeding mechanism, and the bail roller loading position and the release position are toggle mechanisms. Release the transmission of the driving force of the clutch mechanism by holding it by In, characterized in that Beirurora be held in either the loading position or the release position.

Further, according to the present invention, further, detection means for detecting whether the bail roller is at a loading position or a release position, and movement of the carriage out of the printing area and printing on the carriage based on the detection result of the detector. And a control means for controlling the rotation direction of the paper feed mechanism when it is outside the area.

[Operation] Therefore, the loading mechanism according to the present invention can control the bail roller swinging mechanism by the driving force of the paper feeding mechanism by engaging / disengaging the clutch mechanism, and the engaging / disengaging of the clutch mechanism is outside the print area of the carriage. It is controlled by moving to.

Therefore, according to the mechanism of the present invention, the position of the bail roller can be controlled by effectively utilizing the driving force of the carriage and the paper feed, without the need for a special motor.

Then, the loading position and the release position of the bail roller are held by the toggle mechanism, and as a result,
In particular, at the release position of the bail roller, the carriage is arbitrarily used for centering movement or printing operation, and in such a state, the paper feed of the paper itself can be controlled in both forward and reverse directions. .

Further, according to the present invention, the moving direction of the bail roller can be controlled by the position of the bail roller, and a reliable operation can be performed regardless of whether the initial position of the bail roller is the loading position or the release position.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a plane view of an essential part of an auto paper loading mechanism including a bail device according to the present invention, and FIG. 2 shows a configuration of the auto loading mechanism as seen from the side of the printer.

A platen shaft 14 of a platen 12 is pivotally supported on the printer side plate 10, and cut paper or tractor paper is wound around the platen 12 to feed the paper to a desired position. In the case of cut paper, a pinch roller is provided in close contact with the platen, and the cut paper is fed by rotation of the pitch roller and the platen.

On the other hand, in the case of tractor paper, the pinch roller is detached from the platen, and the tractor paper is fed by the tractor gear 18 fixed to the tractor shaft 16 supported by the printer side plate 10.

Although not shown in detail in FIGS. 1 and 2, the platen 12 has a print head that is movable in the axial direction in proximity to the platen 12, and dot impact, thermal transfer or A desired printing action is performed by an inkjet or the like.

Of course, the print head is carried on a carriage,
The movement of the platen 12 along the axial direction is controlled.

In FIG. 1, the carriage is slidably supported by a carriage shaft 20, and as will be described later, the carriage moves on the carriage shaft 20 outside the printing area and the printing area characteristic of the present invention. The drive is controlled by a pulse motor or the like.

A paper feed mechanism for rotating the platen 12 and the tractor shaft 16 to feed the paper is provided, and the drive source of this paper feed mechanism is a paper feed motor 24 fixed to the motor substrate 22. The motor board 22 is fixed to the printer side plate 10 by columns 26 and 28.

A pinion 30 is fixed to the main shaft 24a of the paper feed motor 24, and the pinion 30 meshes with a transmission gear 32.

The transmission pinion 34 of the transmission gear 32 meshes with the platen gear 36 fixed to the platen shaft 14, and as a result, the driving force of the paper feed motor 24 is decelerated and transmitted to the platen 12 to drive the paper feed mechanism of the paper. It is understood that they make up.

Further, the tractor gear 18 is meshingly coupled to the transmission pinion 34 via an idler 38, and as a result,
In the case of tractor paper, rotation of the tractor gear 18 allows the paper to be fed and driven correctly.

In order to properly hold the sheet in close contact with the platen 12, as is well known, a bail roller 40 is provided, and the bail roller 40 is mounted on the bail roller shaft 42 at a plurality of intervals, depending on the width of the sheet as necessary. The mounting interval can be adjusted along the axial direction of the shaft 42.

The bail roller shaft 42 is fixed to one end of a bail lever 44 in order to swing the bail roller 40 between a loading position in which the platen 12 is in close contact with the platen 12 and a release position in which the bail roller is separated from the platen 12. It is swingably supported on 10. A bail lever gear 44a is formed at the other end of the bail lever 44, and a swing gear 48 meshes with the bail lever gear 44a. Therefore, it is understood that when the swing gear 48 is rotationally driven, the bail roller 40 is swing-controlled to the loading position and the release position about the bail lever shaft 46 via the bail lever gear 44a.

In the present invention, the loading position and the release position of the bail roller 40 are toggled and held at each position by a toggle mechanism. Therefore, the bail lever 44 is provided with a spring hook 44b as shown in FIG. Together with the toggle spring 43, it constitutes a toggle mechanism.

The toggle spring 43 has one end fixed to a spring hook pin 45 fixed to the side plate 10 and the other end hooked on a spring hook 44b of the toggle lever 44.

Therefore, in the loading position of FIG. 4, the pulling force of the toggle spring 43 gives a rotational driving force in the counterclockwise direction about the lever shaft 46 to the toggle bar 44, and as a result,
The bail roller 40 shown in FIG. 4 can securely hold the loading position in the state of being pressed against the platen 12, and at this time, an appropriate pressing force can be generated against the paper.

On the other hand, as is clear from the explanation below, the toggle lever
In the state in which 44 is rotated to the release position as shown in FIG. 5, the toggle spring 43 applies a rotational driving force in a clockwise direction to the toggle lever 44 about its lever shaft 46,
As a result, it is clear that the toggle spring 43 reliably holds the release position shown in FIG. 5 by the toggle.

A further characteristic of the present invention is that the rocking mechanism of the bail roller 40 is linked via a clutch mechanism so that the paper feeding mechanism can be engaged and disengaged, and in the embodiment, the rocking gear 48 is A clutch shaft 50 of the clutch mechanism is axially supported so as to be slidable in the axial direction and integrally rotatable in the rotational direction.

The clutch shaft 50 is slidably and rotatably supported by the printer side plate 10 and the motor substrate 22.
Clutch return spring 54 inserted between the bearing ring 52 and the receiving ring 52
Is always urged in the direction of arrow A.

Two fixing rings 56 and 58 are fixed to the clutch 50 shaft, and the inner clutch plate 60, which is prevented from moving in the axial direction by one fixing ring 58, rotates about the clutch shaft 50 slidably in the axial direction. It is mounted so that it rotates in one direction. A clutch spring 62 is inserted between the inner clutch plate 60 and the fixed ring 56, and the inner clutch plate 60
Is urged in the direction of arrow B on the clutch shaft 50.

Further, an outer clutch gear 64 is rotatably supported on the clutch shaft 50.

As described above, the clutch mechanism of the present invention is configured, and the outer clutch gear 64 of the clutch mechanism meshes with the transmission gear 32 by the clutch transmission pinion 66 and the clutch transmission gear 68 pivotally supported on the motor board 22. Therefore, it is understood that the outer clutch gear 64 is constantly driven to rotate by the paper feed motor 24.

As described above, the clutch mechanism normally disengages the inner clutch plate 60 from the outer clutch gear 64 by the clutch return spring 54 as shown in FIG. Outer clutch gear
Only 64 rotates, the inner clutch plate 60 and the bail lever gear 44a meshing with this does not rotate,
The bail roller 40 is not affected by the paper feed driving force during normal paper feeding.

However, it is understood that when the clutch mechanism is switched to the engaged state, the driving force of the paper feed motor 24 directly acts as the driving force for rocking the bail roller 40.

FIG. 3 shows an example of a carriage 70 used for engaging and disengaging the clutch according to the present invention. The carriage 70 carries a print head (not shown in detail) and is wound around the platen 12. The print head performs a desired printing operation on the formed sheet.

Further, in the present invention, the carriage 70 moves from the normal print area indicated by the symbol C to the outside of the print area indicated by the symbol D, and at this time, the end surface 70a of the carriage 70 moves the clutch shaft 50 of the clutch mechanism. It is moved in the direction of arrow B.

Therefore, at this time, the inner clutch plate 60 has the outer clutch gear 64.
The rotation of the outer clutch gear 64 is transmitted to the rotation of the clutch shaft 50 via the inner clutch plate 60, and the rotation of the clutch shaft 50 is also transmitted from the oscillating gear 48 to the bail lever gear 44a of the bail lever 44. Be transmitted to. Thus, the clutch engagement state shown in FIG.
When the paper feed motor 24 is rotated in this state, it can be used as the swinging force of the bail lever 44 by engaging the clutch.

As described above, according to the present invention, it is possible to control the swing of the bail roller to the loading position and the release position by the paper feed driving force by engaging the clutch by moving the carriage to the outside of the printing area. Further, the loading position and the release position can be held by toggle, but in the present embodiment, various sensors are provided for controlling the swing movement of the bail roller.

The sensors include a home position sensor of the carriage 70, a bail roller sensor that detects a loading position and a release position of the bail roller 40, and a sheet sensor that indicates a sheet supply state to the platen.

The home position sensor 80 of the carriage 70 is shown in FIG.
Is provided as a non-contact photoelectric sensor in the vicinity of the movement path of the carriage 70 in order to optically detect the home position of the carriage 70 during printing.
Of course, the home position sensor 80 may be either a light transmission type or a light shielding type, or another contact contact type sensor.

Therefore, by the home position sensor 80, the carriage
It is possible to detect the movement of the 70 to the left end normally, and in a general printing state, the left position of the carriage 70 is determined by the home position sensor, and when the bail roller is swung in the present invention, the home position sensor is detected.
By further moving the carriage 70 to the left from the home position detected by 80, engagement / disengagement of the clutch mechanism can be controlled by the carriage 70 as described above.

4 and 5, the bail roller sensor 82 and the paper sensor 8 are shown.
4 is shown.

The bail roller sensor 82 is a contact contact type sensor,
Detecting the gear end 44c of the bail lever 44, the sensor 82 is off when the bail roller 40 is in the loading position as shown in FIG. 4, and the bail roller sensor 82 is in the release position of the bail roller 40 shown in FIG. The contact point of is urged to the ON state by the gear end 44c, and this bail roller sensor 82 can particularly detect the release position of the bail roller 40.

On the other hand, the paper sensor 84 is arranged below the platen 12, and the paper is not shown in detail with the platen 12.
A pinch roller is formed so that it detects that it has been fed into the apparatus until it is pinched by the pinch roller and outputs a signal, and for this purpose, it is formed of a reflective photo interrupter.

The operation of the automatic paper loading method according to the present invention will be described in detail below.

When the paper is cut paper, the pinch roller (not shown) is brought into close contact with the platen to drive the paper feed as described above, and when the tractor paper is used, the pinch roller is separated from the platen, and the tractor paper is illustrated. It is set in a tractor unit that is not installed, and the paper is driven by the driving rotation of the tractor gear 18. Since the printer of the present invention is fully automatic paper loading, the paper feed switch on the operation panel is turned on after the completion of paper loading as described above.

First, for example, a pulse motor for driving the carriage moves the carriage 70 to outside the printing area D shown in FIG.
This brings the clutch mechanism into the engaged state as described above. Practically, in this clutch engagement state, the contact force between the inner clutch plate 60 and the outer clutch gear 64 is determined by the compression force of the clutch spring 62, and a substantially stable engagement action is always obtained.

The clutch mechanism includes a fixed ring 58 and an outer clutch gear 64.
Since there is a play between the bail roller 40 and the bail roller 40, it is not necessary to control the movement of the carriage 70 to the outside of the printing area with high accuracy to control the swing of the bail roller 40.

When the clutch engagement state is achieved as described above,
Next, when the paper feed motor 24 rotates in the reverse direction, the paper feed drive force is transmitted as the rocking force of the bail roller 40, and the bail lever 44 moves.
Swings clockwise from the loading position 100 shown in FIG. 2 toward the release position 200. Therefore, it is understood that the drive control of the paper feed motor 24 surely separates the bail roller 40 from the platen 12 and moves to the release position 200.

When the bail roller 40 is securely separated from the platen 12 to the release position 200, the carriage 70 moves rightward in FIG. 3 toward the inside of the printing area C, and as a result, the clutch mechanism is disengaged. However, in this state, the force of the toggle spring 43 acts on the bail lever 44 as shown in FIG. 5, and the bail roller 40 is released at the release position 20 even when the clutch mechanism is disengaged.
Can hold 0.

Next, in the released state of the bail roller 40, the paper feed motor 24 feeds the paper to a predetermined position by the forward rotation of the paper feed motor 24, and the paper feed is completed without the hindrance of the bail roller 40. Of course, during such paper feeding, the leading edge position of the sheet position is detected and stored by the sheet sensor 84, so that the printer controller can correctly grasp the leading edge position of the sheet.

The paper feed amount at this time may be a feed amount at which the leading end position of the paper reaches a predetermined print start position, and is also reduced by the forward rotation amount for returning the bail roller 40 to the loading position 100 described below. The amount may be set.

When the sheet is fed to the desired position as described above, the loading operation of the bail roller 40 is performed next.

The loading action of the bail roller 40 first moves the carriage 70 to the outside D of the printing area and engages the clutch mechanism as in the release action.

Then, in this state, the paper feed motor 24 performs the forward transfer, whereby the bail roller 40 moves to the loading position 100 shown in FIG. 2 and the desired loading action is completed. In this state, the bail roller 40 is pressed against the platen 12 by the spring force of the toggle spring 43, as shown in FIG.

In this manner, the carriage 70 again moves rightward in FIG. 3 toward the print area C while the bail roller 40 is pressed against the platen 12, and as a result, the clutch mechanism is released.

As described above, a series of auto paper loading is completed, and without any operation of the operator,
In addition, the bail roller does not require a special drive mechanism.
40 swings are performed automatically.

Further, in the present invention, when the paper needs to be used for the printing operation up to the margin of the upper margin, the printing operation can be started during the release of the bail roller 40 to the release position 200 described above.

At this time, since the leading edge of the sheet has not reached the position of the bail roller 40, the loading operation of the bail roller is performed in a state where the leading edge of the sheet protrudes from the bail roller 40 by a predetermined amount by a plurality of printing operations or feeding.

This loading action is performed by clutch engagement by the carriage 70 and subsequent forward rotation of the paper by the paper feed motor 24. As a result, bail roller loading during printing causes the paper to move to the print position in the forward paper feed direction. As a result, a deviation corresponding to the amount advanced by 1 is generated. Finally, the deviation is corrected by the paper feed motor 24 in which the paper is fed in the reverse direction by the amount of forward rotation.

In either case, it is possible to fully automatically control the paper feed and the bail roller swing.

FIG. 6 shows a flow chart in the case where the cut paper in this embodiment is auto-paper loaded to perform leading edge printing or upper margin printing, and the operation thereof will be described below in sequence.

The leading edge printing is a method of starting printing from the upper end with almost no margin at the upper end of the paper. In this case, the bail roller performs a desired printing operation in a state of being held at the release position. According to this, since the release position is toggle-held, even in the case of such leading edge printing, it is possible to arbitrarily rotate the paper feed forward and reverse to use high-density printing or double-strike printing. .

Further, the upper margin printing is a normal printing in which an arbitrary margin is given to the leading end of the paper for printing, and the bail roller must already be returned to the loading position at the start of printing.

When the paper feed switch on the operation panel is turned on (step 301), the bail roller switch 82 determines whether or not the bail roller 40 is at the release position (step 302).

Normally, the bail roller 40 is in the loading position shown in FIG.
When 0 is driven to the left, the clutch is engaged as described above.

Next, in step 304, reverse rotation paper feeding is performed, and the bail roller 40 moves away from the release position shown in FIGS. 4 to 5 via the clutch mechanism.

Then, in step 305, the movement of the bail roller 40 to the release position is judged again by the bell roller switch 82, and the steps 303 and 304 are repeated until the bail roller 40 surely moves to the position shown in FIG.

When the bail roller switch 82 is turned on in step 305, that is, when the bail roller 40 reaches the release position, the carriage 70 is centered in step 306 to prepare for the correct printing action on the supplied paper or the paper is centered. Holds at.

In the present invention, the release position of the bail roller 40 is securely held by the toggle mechanism, and even if the carriage 70 is centered and the clutch mechanism is in the disengaged state, the bail roller 40 is still toggle-held, so that the bail roller 40 is moved to the loading position. There is no returning.

Of course, in step 302, if the bail roller 40 is already in the release position, the operation directly proceeds from step 302 to step 306.

When the reliable release control of the bail roller 40 is completed as described above, forward rotation sheet feeding is performed in step 307, and leading edge printing or upper margin printing is selected in step 308.

The switching between the leading edge printing and the upper margin printing is determined by a command from the operation panel by the user. When the leading edge printing is selected, the forward rotation paper feed is performed to the leading edge in step 309, and this sheet feeding control is performed by a predetermined number of steps after the leading edge of the sheet is fed to the pinch roller by the sheet sensor 84. It is done by doing.

In the case of leading edge printing as described above, the bail roller 40
In the release position, the leading edge of the paper advances to the print position, and normal printing is started in step 310.

In this way, printing at the release position of the bail roller 40 is continued until the leading edge of the paper exceeds the bail roller position, and when the number of paper feeding steps reaches the feeding amount exceeding the bail roller position, the loading action of the bail roller 40 is started. It

This loading action is initiated by first shifting the carriage 70 to the left in step 312 and then engaging the clutch. When this clutch engagement is performed,
In step 313, forward rotation paper feed is performed, and as a result, the fifth
The bail roller 40 that was in the release position shown in the figure is the fourth
It is driven to the loading position shown in the figure, and this loading position is toggle-held again by the toggle mechanism. Step 314 is centering the carriage, after which
In step 315, unnecessary forward rotation paper feed required for the bail roller loading in step 313 is corrected by reverse rotation paper feed.

As described above, the bail roller 40 is reliably toggle-held at the loading position, and the sheet has returned to the correct printing position again, so printing is restarted in step 316.

On the other hand, when the upper margin printing is selected in step 308, the forward rotation paper feed is performed in step 320, and the paper is fed beyond the bail roller 40 to a position where a desired upper margin is taken. Then, step 312 described above.
As with steps 315 to 315, the loading operation of the bail roller is performed in steps 321 to 324, and the printing operation is started in step 325.

As described above, according to the method shown in FIG. 6, the control of the bail roller is controlled by engaging and disengaging the clutch of the carriage, and the loading position and the release position thereof are always held by the toggle mechanism. It is possible to independently control the feed and bail roller controls to achieve various complicated and high quality printing operations.

[Effects of the Invention] As described above, according to the present invention, it becomes possible to swing the bail roller fully automatically without the need for a dedicated drive source for driving the bail roller, and the paper-sucking paper on the operation panel can be performed. A series of operations are completed only by turning on the switch, and a printer with extremely excellent operability can be realized.

Further, since the bail roller is driven by the paper feed motor, the outer shape of the entire printer is not increased,
Further, unlike the conventional manual bail roller rocking device, the bail lever and the like do not project to the outside, the size of the device is simplified, and the noise leakage from the through hole of the lever is eliminated. It has a great contribution to the realization.

Particularly, in the present invention, the rotation of the paper feeding mechanism is transmitted to the swinging mechanism by the clutch mechanism when the carriage is outside the printing area, and the transmission of the driving force is released when the carriage is in the printing area. Therefore, bidirectional swinging between the loading position and the release position of the bail roller when transmitting the driving force of the clutch mechanism can be performed by the driving force of the paper feeding mechanism.

Therefore, as described in the embodiment, by controlling the paper feed direction, the bail roller can be moved to the release position at the time of loading the paper, or the bail roller can be moved to the loading position at the time of printing.

Further, in the present invention, when the carriage is in the printing area, the transmission of the driving force by the clutch mechanism is released. At this time, the bail roller is held at the release position or the loading position by the toggle mechanism. Therefore, as described in the embodiment, when performing the upper margin printing, the printing can be performed with the bail roller as the release position. Further, when the carriage is in the print area, the bail roller can be manually moved to the release position or the loading position and can be held in that state by the toggle mechanism.

[Brief description of the drawings]

FIG. 1 is a plan view of essential parts showing a preferred embodiment of an auto paper loading mechanism including a bail device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a clutch mechanism of FIG. FIG. 4 is an explanatory view showing the engaged state, FIG. 4 is an explanatory view showing the structure of the toggle mechanism in the present embodiment, and FIG. 5 shows the toggle holding state when the bail roller swings from the loading position to the release position in FIG. FIG. 6 is a flowchart showing an example of auto paper loading in this embodiment. 12 …… Platen 24 …… Paper feed motor 40 …… Bail roller 43 …… Toggle spring 44 …… Bail lever 48 …… Swing gear 50 …… Clutch shaft 60 …… Inner clutch plate 64 …… Outer clutch gear 66 …… Clutch Transmission pinion 68 …… Clutch transmission gear 70 …… Carriage

Claims (2)

(57) [Claims] 1. A platen for winding and holding a paper at a predetermined printing position, a bail roller for pressing the paper against the platen, a paper feeding mechanism for feeding the paper by a predetermined amount, and a paper facing the platen. In a printer including a print head that performs a predetermined printing action against the print head and a carriage that drives the print head to feed along the platen axis direction, a loading position for pressing the bail roller against the platen and a release position for separating from the platen. A swing mechanism for swinging between the swing mechanism and a clutch mechanism provided between the swing mechanism and the paper feeding mechanism for transmitting or releasing a driving force to the swing mechanism by the paper feeding mechanism, wherein the carriage is When the carriage is in the print area, it swings from the paper feed mechanism when the drive force is transmitted when it moves out of the print area. A clutch mechanism for releasing the transmission of the driving force to the structure, and a toggle mechanism for holding the loading position and the release position of the bail roller in an elastic pressure state, respectively. When the driving force of the mechanism is transmitted, the bail roller swings toward the loading position by the rotation of the paper feed mechanism in one direction, and the bail roller swings toward the release position by the rotation of the opposite direction, and further, the loading position of the bail roller. And the release position are bidirectionally oscillated by the drive force of the paper feed mechanism, and the loading position and the release position of the bail roller are held by the toggle mechanism, respectively, so that when the drive force transmission of the clutch mechanism is released, Place the bail roller in the loading position or Vail device of the printer, characterized in that to both can hold the scan position. 2. The apparatus according to claim 1, further comprising detection means for detecting whether the bail roller is in a loading position or a release position, and a print area of the carriage based on a detection result of the detector. A bail device for a printer, comprising: a control unit that controls an outward movement and a rotation direction of a paper feeding mechanism when the carriage is outside the printing area.